Ann Allergy Asthma Immunol
BlisterCoitusDiagnosis, Differential
Dr. William Wei Ming Chen, MD
NPI1851498372PAC ID9032215322
- Medicare services, 2024
- 3,099
- Medicare patients, 2024
- 496
- Part D claims, 2024
- 16,980
- Publications
- 2
- MIPS score, 2024
- 83
- Practice address
- 2089 Vale Rd # 34, San Pablo, CA 94806
- Practice phone
- Call (510) 235-9247
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
William Chen, MD
Physician office · San Pablo, California
Find Dr. Chen's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. William Wei Ming Chen is an internist in San Pablo, California
Dr. Chen practices at William Chen, MD in San Pablo, California.
Dr. Chen's NPI, 1851498372, was assigned on September 19, 2006. Dr. Chen graduated from Weill Cornell Medicine in 1998. Dr. Chen holds California license A070200.
NPI and contact details
- NPI
- 1851498372NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9032215322
- NPI enumeration date
- September 19, 2006
- NPI status
- Active
- Offers telehealth
- Yes
- Practice phone
- (510) 235-9247
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William Wei Ming Chen practices at William Chen, MD in San Pablo, California
Dr. Chen's primary practice is William Chen, MD, at 2089 Vale Rd # 34, San Pablo, CA 94806. The practice phone is (510) 235-9247.
- William Chen, MD2089 Vale Rd # 34, San Pablo, CA 94806Phone(510) 235-9247
Source: Dmand AI Affiliation Data
Dr. William Wei Ming Chen is affiliated with 11 sites of care
Dr. Chen's primary practice is William Chen, MD in San Pablo, California. Dr. Chen is also affiliated with Stanford Hospital at 300 Pasteur Drive. Dmand AI also links Dr. Chen to 4 more hospitals and 5 home health agencies, each named with a free account.
William Chen, MDPrimary
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. William Wei Ming Chen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chen practices, 11 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| William Chen, MD | Available with a free account |
| +10 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every site where Dr. Chen practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. William Wei Ming Chen is one of 16,751 internists in California
Internal medicine is Dr. Chen's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Chen is board certified in allergy & immunology by the American Board of Allergy and Immunology. Dr. Chen is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acid reflux, acute sinusitis, acute skin infection, aneurysm, ankle or foot injury, arthritis, asthma and atrial fibrillation and flutter among the conditions Dr. Chen treats.
Internists near Dr. Chen
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
16,751internists in California
3internists in San Pablo
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William Wei Ming Chen billed Medicare for 3,099 services in 2024
CMS data shows 3,099 Medicare services from Dr. Chen across 13 procedure codes in 2024, for 496 Medicare patients. Medicare paid $213,135 for them. Every service was in an office.
Medicare services, 20243,099
Medicare patients496
Paid by Medicare$213,135
Procedure codes13
Dr. Chen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,8252024: 1,8723%
- Other services
- 2023: 7442024: 90221%
- Tests and treatments
- 2023: 5092024: 32536%
Dr. Chen compared with the California median for internists, 2024
- Dr. Chen
- California median
- Medicare services
- 3,099vs 3618.6 times
- Medicare patients
- 496vs 1513.3 times
- Part D claims
- 16,205vs 42138.5 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Chen's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Chen?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chen and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Wei Ming Chen treated 496 Medicare patients in 2024, average age 75
CMS counts 496 Medicare patients who saw Dr. Chen in 2024. The largest group is 65 to 74, with 184 patients. 75% of them have high cholesterol, and 74% have high blood pressure. 65% are also on Medicaid. Their average risk score is 1.26, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Chen's median patient age at 68, with 52% women.
Medicare patients, 2024496
Average age75
Average risk score1.26
Also on Medicaid65%
Dr. Chen's Medicare patients by age, 2024
Dr. Chen's Medicare patients by sex, 2024
- Women28557%
- Men21143%
Chronic conditions among Dr. Chen's Medicare patients, 2024
- High cholesterol75%
- High blood pressure74%
- Diabetes38%
- Arthritis30%
- Chronic kidney disease17%
- Ischemic heart disease15%
- Depression13%
- Mood disorders13%
Share of Medicare patients with each condition. A patient can have several.
Dr. Chen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women52%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William Wei Ming Chen wrote 16,980 Medicare Part D claims in 2024
In 2024, Dr. Chen wrote 16,980 Medicare Part D claims for 833 patients. 84% of them were for generic drugs. CMS names the drug for 16,205 of them, across 212 drugs with 11 or more claims each, at $1,786,529 in total drug cost. In 2023, CMS named 17,071 claims across 217 drugs.
Part D claims, 202416,980
Drugs named by CMS212
Total drug cost$1.8M
Part D patients833
Dr. Chen's Part D claims by kind of drug, 2024
- Generic14,258 claims84%
- Brand-name2,580 claims15%
- Other142 claims1%
Dr. Chen's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Chen's Part D claims, 2024
- Opioids6%1,051 of 16,980 claims
- Antibiotics2%373 of 16,980 claims
- Antipsychotics, patients 65 and over1%90 of 16,980 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 17,0712024: 16,2055%
Drugs named by CMS: 212 in 2024, 217 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. William Wei Ming Chen scored 83 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 83 out of 100 for Dr. Chen for performance year 2024, reported individually. CMS lists Dr. Chen as offering telehealth.
- Offers telehealth
- Yes
Dr. Chen's MIPS scores, performance year 2024
- 83of 100Final score
- 60of 100Quality
- 40of 100Improvement Activities
- 81of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
For MedTech and pharma teams
Find internists like Dr. Chen by procedure volume and prescribing
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. William Wei Ming Chen has 2 publications on record
Dmand AI links 2 papers to Dr. Chen.
Papers2
Recent publications by Dr. Chen
See who Dr. Chen researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Chen works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. William Wei Ming Chen received $9,779 in industry payments from 2016 to 2025
CMS Open Payments shows 543 general payments to Dr. Chen from 32 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 98% of the total. AstraZeneca Pharmaceuticals LP paid the most, $2,501.
General payments to Dr. Chen by program year, 2016 to 2025
General payments to Dr. Chen by kind, 2016 to 2025
$9.8Kin total
- Food and beverage$9,59398%
- Education$1862%
Companies that paid Dr. Chen the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William Wei Ming Chen graduated from Weill Cornell Medicine
Dr. Chen graduated from Weill Cornell Medicine in 1998.
- Medical school
- Board certified in allergy & immunology
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. William Wei Ming Chen accepts plans from 12 insurance carriers
Dr. Chen is in network with 12 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Elevance. Medicare plans come from the most carriers, 10. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Elevance
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Humana
- Regence Health Plans
- +4 more carriersWith a free account
Plan types Dr. Chen accepts, by number of carriers
- Medicare10
- PPO8
- HMO4
- POS4
- EPO2
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. William Wei Ming Chen's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William Wei Ming Chen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William Wei Ming Chen's NPI number?
Dr. William Wei Ming Chen's NPI number is 1851498372. It was assigned on September 19, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William Wei Ming Chen?
Dr. William Wei Ming Chen is an internist in San Pablo, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. William Wei Ming Chen practice?
Dr. Chen practices at 2089 Vale Rd # 34, San Pablo, CA 94806. Dr. Chen's primary practice is William Chen, MD in San Pablo, California. Dmand AI also links Dr. Chen to 4 hospitals and 5 home health agencies.
What is Dr. William Wei Ming Chen's office phone number?
The practice phone on file for Dr. Chen is (510) 235-9247.
What is Dr. William Wei Ming Chen's medical license number?
Dr. Chen holds California license A070200.
Which hospitals is Dr. William Wei Ming Chen affiliated with?
Dr. Chen is affiliated with Stanford Hospital at 300 Pasteur Drive. Dmand AI links Dr. Chen to 4 more hospitals.
Does Dr. William Wei Ming Chen accept Medicare?
Yes. CMS data shows Dr. Chen billed Medicare for 3,099 services in 2024.
Does Dr. William Wei Ming Chen offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Chen as offering telehealth services.
What is Dr. William Wei Ming Chen's MIPS score?
Dr. Chen's MIPS final score for performance year 2024 is 83 out of 100, reported individually.
How many Medicare patients does Dr. William Wei Ming Chen see?
CMS counts 496 Medicare patients who saw Dr. Chen in 2024, with an average age of 75.
Show 8 more questionsShow fewer questions
Is Dr. William Wei Ming Chen board certified?
Yes. Dr. Chen is board certified in allergy & immunology by the American Board of Allergy and Immunology.
What services does Dr. William Wei Ming Chen bill to Medicare?
In 2024, Dr. Chen's most billed Medicare services were office visit, established patient (99213), medicare service (G0442) and medicare service (G0439).
Where did Dr. William Wei Ming Chen go to medical school?
Dr. Chen graduated from Weill Cornell Medicine in 1998.
What drugs does Dr. William Wei Ming Chen prescribe most?
In 2024 Medicare Part D data, Dr. Chen's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Hydrocodone-Acetaminophen.
Has Dr. William Wei Ming Chen received payments from drug or device companies?
CMS Open Payments shows $9,779 in general payments to Dr. Chen from 32 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. William Wei Ming Chen been practicing?
Dr. Chen graduated from medical school in 1998, 28 years ago.
Does Dr. William Wei Ming Chen do research?
Dmand AI links 2 publications to Dr. Chen.
What insurance does Dr. William Wei Ming Chen accept?
Dr. Chen is in network with 12 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Elevance. Medicare plans come from the most carriers, 10. Check the plan with the practice before a visit.
Selling to internal medicine practices?
See internists in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card